People who wonder why the igloo won't melt even if it's heated by the fire, essentially know too little about the concept of cold.
It is difficult for most people to understand what it feels like to turn the air conditioner to the highest temperature and full power in winter, but it can still freeze to death indoors.
But many northerners can.
What can't be done with modern air conditioners and heating, how can a fire that can only heat one person do it?
"Ice's thermal insulation is so good that the outside and inside are completely different temperatures. Therefore, the ice and snow on the inner surface will indeed melt a layer, but when the cold air comes later, it will freeze again and turn into ice cubes.
So lighting a bonfire in the cave not only doesn't melt the igloo, it makes it even harder."
Bi Fang shook his body, explained briefly, and continued to plow the snow.
The environment was dim, and although the sky could not be seen, one could tell that it was night. Bi Fang had to be extra careful to avoid snowflakes falling into his shoes. In such extreme cold, getting the shoes wet would be fatal.
It's easy to find bushes for making fire, but it's hard to find edible food.
Before the wind and snow came, the shrubs were all exposed on the ground, and they were easily visible. Yesterday, with just a few glances, Bifang used his strong memory to memorize the locations of all the shrubs. Now he only needs to follow the map to find out.
Although the heavy snow blurs the distance, you can always find it if you explore more.
But things like moss and lichen were bought under the snow before the storm came. There was no place for Bi Fang to record them, so he had to rely on luck to search.
Once I touched it, I kept touching it for nearly twenty minutes.
Staying in the snowstorm for even one minute is a huge test of physical strength. Bi Fang's limbs have begun to become stiff. If he hadn't been moving all the time, he might have been unable to move.
Fortunately, after digging for nearly five or six meters, a touch of green finally appeared on the screen.
Tundra plants are mostly perennial evergreen plants, which can make full use of the short vegetative period without having to waste time growing new leaves and completing the entire life cycle. However, the short vegetative period makes tundra plants grow very slowly.
Although there were not many mosses and lichens in front of him, Bifang still regarded them as treasures. These are good things that can save lives.
Bi Fang became very energetic and dug them all up. He didn't care about the young leaves or not. He took them back and said that if you can't eat them, you can also use them to make a fire.
In a world of ice and snow, plants are the most precious resources.
Alone, Bi Fang staggered forward in the ice and snow. He was cold and hungry, and his hands and feet were almost on the verge of losing consciousness. Fortunately, his brain was still clear and he would not have hallucinations. An hour after leaving the cave, he dug up a second lichen patch.
Bi Fang couldn't hold on any longer.
He lifted up his legs, which were as cold as popsicles, and followed the rope back into the hole.
"hiss."
Bi Fang shook off all the snowflakes on his body, and every muscle wailed and trembled under the severe cold.
The fat that was originally stored was consumed in large quantities. Although the whole person did not look noticeably thinner, the change in body weight was still noticeable by Bi Fang himself.
Of course, it is impossible for ordinary people to lose weight directly without eating for three days, but in the Arctic, this situation may happen.
In the cruel test of minus 50 degrees that nature gave Bifang, his life depended entirely on his body fat, and his previous weight gain was not in vain.
In the cave, Bi Fang took off his shoes. Although he had been very careful, the snowflakes in the storm were all-pervasive. Although his toes were completely frozen, he could still see that the parts of his socks were wet from the melted snow. If he had continued just now,
When digging snow, you may face the risk of necrosis.
Under excessive cold, necrosis of limbs, especially toes, is very common even in modern times.
After eating and so on, Bi Fang now has to make a campfire to dry his shoes, otherwise it will completely freeze his feet.
Taking out all the dry branches and hay from his backpack, Bifang picked out the appropriate materials and started simply drilling wood to make a fire.
"There is no shortage of fuel in such an environment. There are actually large forests in Greenland, but we don't have them here. There are only shrubs, but they are also good materials. And they are very dry."
"It may seem like these dead branches and leaves are buried in the snow and will become very wet, but in fact there is very little moisture in them."
"This is a simple physical phenomenon. When it snows, the temperature is low. When the temperature is low, the saturated vapor pressure of the air is low, so the water vapor that can be carried in the air is very little. When dry air comes into contact with moist objects, it will cause
More of the water inside the object evaporates, causing it to become drier."
[No wonder my skin always feels so dry in winter]
【Except for Spongebob, none of them can get wet with water.】
[Dry climate in autumn and winter is the mainstream of global climate]
Bi Fang took off his gloves, unbuttoned his jacket and took out the matches. He had to succeed at once because his hands were already frozen in just this moment.
He didn't have any fire-making materials on him, so he could only use the most primitive method of drilling fire. Even because of the limited materials, he could only drill wood to make fire.
Use a knife to scrape a branch into a velvety shape to create a simple tool.
With Bi Fang's current master-level experience, although his fingers were a bit stiff, drilling wood actually relied more on rubbing the drill with his palms and the strength of his arms, and he successfully ignited black smoke in just one time.
The bonfire was lit, and Bifang put his hand close to the flame, and his blood immediately became active.
Putting the shoes on the fire to roast them slightly, Bi Fang put them on his feet again. An indescribable feeling of comfort rushed up the spine, making people want to stretch.
Bi Fang wanted to change into a comfortable position, so he leaned against the wall of the cave. Suddenly, the snow fell.
The fire went out.
Um?
Bi Fang looked up in surprise, only to find that a thick piece of snow had fallen off the top of the arched snow roof at some point, like the white wall covering that had fallen from a ceiling that had been in disrepair.
The sudden accident stunned everyone.
There was even silence for a full minute before Bifang's voice sounded again.
"This is the consequence of digging first and then rebuilding."
If you were building an igloo normally, you would naturally use snow bricks and build thick snow bricks piece by piece, but Bifang's method was to dig a big hole and then paste the top into an arch shape.
What is made by this kind of engineering is naturally not as strong and stable as the pieces stacked together. It is normal for one or two pieces to fall off occasionally.
Perhaps it was due to the slight deformation and detachment just due to the change in temperature. Coupled with the slight vibration, the fire was accidentally destroyed and just ignited.
Bi Fang had to start the fire again. This was the last chance, because his hands no longer obeyed his control, and his toes even began to tingle. He put on gloves and beat his thighs desperately until his hands could feel again.